The Therm-ic heated vest fights against extreme cold by dividing the heat into 5 heated places, which are located on the abdomen and back. The vest is very thin and light, it can be easily worn under the top jacket and takes up very little space in the backpack when folded. Ideal for all your outdoor activities. POWERBANK is not included, purchased separately. Therm-ic POWERBANK can be found in Accessories. The heater works with all external chargers. INTEGRATED BLUETOOTH: the required heat can be easily regulated via the Therm-ic application from your smartphone. Simply plug the "U-PACK cable" (included) into the USB cable in the jacket pocket and then connect the power bank (not included). The power bank can also be connected directly, but then the heat cannot be regulated. 5 ultra-thin heating elements, allowing for good heat distribution around the stomach, pockets, kidneys, and back Compact and lightweight, you can easily fold up your jacket and save space in your back Jacket made without materials of animal origin Ideal for full enjoyment of your outdoor activities whatever the season Maintenance instructions: Only gentle hand wash (maximum temperature 30 C). Before washing, be sure to remove the batteries and attach the protective cover to the USB cable against intrusion. Follow the maintenance instructions inside the jacket. DO NOT USE BLEACHER OR LAUNDRY SOFTENER.